Casting machines



CASTING MACHINES 4 Sheets-Sheet 1 Filed Aug. 26, 1955 May 20, 1958 P. FOURON ETAL 2,835,006

CASTING MACHINES 4 Sheets-Sheet 2 Filed Aug. 2, 1955 May 20, 1958 Filed Aug. 26, 1955 CASTING MACHINES 3 4 She'ets-Sheet 3 25 v 272 29 f, 1245 g 29 272'. 2a /9 y I V 30 2 A 6 9 7 3 4 6 8 20 J 30 \s X May 20, 1958 P. FOURON ETAL CASTING MACHINES 4 Sheets-Sheet 4 Filed Aug. 26, 1955 United States Patent-O CASTING MACHINES Pierre Fouron, Chatenay-Malabry, and Georges Bourret,

Boulogne-sur-Seine, France, assignors to Societe Civile dEtudes pour Materiel de Fonderie, Bagneux, France Application August 26, 1955, Serial No. 530,684

Claims priority, application France September 29, 1954 4 Claims. (CI. 2293) In order to remove the object moulded in the machine according to the invention, the central key is withdrawn, whereafter one of the side pieces is pivoted in such manner as to be retracted into the space left free by the central key, and this piece is extracted from the moulded article by sliding the pivoted piece in a direction parallel to its pivoting axis. Asimilar procedure is followed with the second side piece after the first withdrawn piece has been returned angularly to its initial position relative to the withdrawn key.

Preferably, the means for controlling the pivoting and sliding movements of the side pieces consists of hydraulic or pneumatic jacks. It is also preferable for the side pieces to be so mounted as to be pivotable about a common axis. In this case, one of the side pieces is advantageously fixed to a hollow cylinder which is slidably mounted on the frame of the machine and in which a piston secured to the other piece is movably mounted.

A moulding machine constructed according to the invention will hereinafter be described by way of nonlimitative example with reference to the accompanying drawings, in which:

Figure 1 shows the machine in elevation as seen in the direction of the arrow F of Figure 2;

Figure 2 is a section through the machine on the line II-II of Figure 1;

Figure 3 is a section through the machine on the line IIIIII of Figure 2;

Figure 4 is a section through the machine on the line IVIV of Figure 2; and

Figure 5 is a view similar to that of Figure 2, showing the movable parts in another position.

As illustrated in the drawings, the machine according to the invention is designed to mould cylindrical articles having an intemal cavity, for example pistons. The mould comprises on the one hand two outer shells 1 cooperating with a fixed support 2, and on the other hand a core consisting of two side pieces 3a and 3b, between which a central key 4 is adapted to be disposed. One of the shells 1 may have a gate 5 (Figs. 2 and 5).

Each of the shells 1 is movable by means of a piston slidable in a double-acting cylinder 6, which is supported by the frame 7 of the machine and which is provided with conduits 8 and 9 serving for the admission or discharge of the operating fluid according to requirements.

The central key 4 is fixed on an arm 10, to which are ice coupled parallel guide rods 11 and a rod 12 of a piston 13. The piston 13 is slidably mounted in a double-acting cylinder 14having its axis parallel to the axes of rods 11 and provided with conduits 15 and 16 for the admission and discharge of the driving fluid. The arm 10 is also provided with a cross member 17 (Fig. 1) forming an abutment as will hereinafter be described.

The side piece 3b is fixed on an arm 18b, which is fixedly connected with a cylinder 19 slidably mounted in a cylinder 20. The cylinder 19 is closed at its base end by a plate 21 forming a piston, and a conduit 22 is provided for the admission of the driving fluid into the cylinder 20. The frame '7 supports an abutment 23 limiting the axial movement of the cylinder 19. Pivotally mounted on the arm 18b at 24 is a plate 25 which is fixedly connected to the rod '26 of a piston slidably mounted in a double-acting cylinder 27!; (Fig. 3). The cylinder 27b has two conduits 28 and 29 opening into the opposite ends and serving for the admission and discharge of the operating fluid.

Similarly, the side piece 3a is fixed on an arm 180 I whichis fixedly connected to a piston 30 slidably mounted in the cylinder 19. The driving fluid may be admitted into the cylinder 19 through a conduit 31 opening axially through the piston 21. The arm may be controlled in the same manner as the arm 18b by a double-acting cylinder 27a into which ducts 28 and 29 open.

The machine hereinbefore described operates as follows: r

Assuming that the moulding of an article has been completed with the parts in the positions of Figs. 1 and 2, dIiving fluid is first fed into the conduit 15, whereby the central key 4 is withdrawn from the cavity of the moulded article. The driving fluid is then supplied successively through the conduit 28 into the cylinder 27a, whereby the side piece 3a is disengaged from the moulded article, through the conduit 31 into cylinder 19 whereby the'pistoni3'0 is extended out of cylinder 19 until the member 18a encounters the abutment 23 and the piece 3a is disengaged from'the moulding cavity, and through the conduit 29 into the cylinder 27a, whereby the side :piece 3a is returned to its initial angular position.

The position of the various moving parts is then as illustrated in Figure 5.

During the following phase of the removal of the article from the mould, the driving fluid is supplied successively through the conduit 28 into the cylinder 27b, through the conduit 22 into cylinder 20, and through the conduit 29 into the cylinder 27b.

These operations have the effect of causing the support 18b of the side piece 3b to rock inwardly, of causing the side piece 3b to be withdrawn from the moulding cavity and of returning the support to its initial angular positron.

Finally, the driving fluid is supplied through the conduit 9 into the cylinders 6, whereby the outer shells 1 are moved apart and thus separated from the moulded article, which can then be removed from its support 2.

In order to perform a further moulding operation, the driving fluid is first admitted through the conduit 16 into the cylinder 14, and, at the same time, fluid is drained from the conduit 15 in the cylinder 14, the conduit 22 in the cylinder 20 and the conduit 31 in the cylinder 19, which operation has the effect of returning the central key 4 into the moulding cavity. In the course of this latter opera tion, the cross member 17 which is fixed to the arm 10 supporting the central key encounters the arms 18a and 18b supporting the side pieces 3a and 3b, and the latter are thus also brought into the moulding cavity. The driving fluid is then supplied through the conduits 8 into the cylinders 6, and the shells 1 are thus returned to their 3 operative position. The machine is then ready for moulding a further article, the molten metal being introduced into the moulding cavity through the gate 5.

It will be obvious that the invention must not',be regarded as limited to the embodiment described and illustrated and that modifications may be made therein with-. out departing from the scope of the present patent.

What we claim is:

1. A machine for molding an article having an internal cavity with bosses within the later extending axially toward each other; said machine comprising a frame, a core for defining the internal cavity of an article to be molded and including a central key and two side pieces disposable at opposite sides of said central key and having recesses therein corresponding to the bosses to be formed, means mounting said central key on said frame and movable relative to the latter for moving said key to and from an operative position between said side pieces, pivot means supporting said side pieces for swinging toward and away from each other with the axis ofv said pivot means lying in a plane that is perpendicular to the axes of the bosses to be formed and located midway between such bosses, and means movably supporting said pivot means on said frame for movement of said pivot means and the related side pieces of said core in directions parallel to the axis of said pivot means.

2. A machine for molding an article having an internal cavity with bosses within the latter extending axially toward each other; said machine comprising a frame, a core for defining the internal cavity of an article to be molded and including a central key and two side pieces disposable at opposite sides of said central key and having recesses facing away from each other and corresponding to the bosses to be formed within the cavity, means mounting said central key on said frame and movable relative to the latter for moving said key to and from an operative position between said side pieces, a

first cylinder fixedly mounted on said frame with its axis lying in a plane that is perpendicular to the axes of the bosses to be formed and that is located midway between such bosses, a second cylinder rotatable and axially slidable in said first cylinder, means mounting one of said side pieces of the core on said second cylinder for swinging movement toward and away from the other of said 4 side pieces about said axis of the first cylinder and for rectilinear movement in directions paralell to said axis of the first cylinder, a piston rotatable and axially slidable within said second cylinder, and means mounting said other side piece on said piston for swnging movement toward and away from said one side piece about said axis of the first cylnder and for rectilinear movement in directions parallel to said axis of the first cylinder.

. 3. A machine as in claim 2; wherein said means mounting the central key on said frame includes a third cylinder fixed on said frame with the axis of said third cylinder being parallel to said axis of the first cylinder, a piston slidable in said third cylinder and a support arm for said central key connected to said piston Qf-the'third cylinder; and further comprising means for supporting pressure fluid alternatively to the opposite ends of said third cylinder for effecting movement of said central key in opposite directions, parallel to said directions of the rectilinear movements of said side pieces, an abutment on said support arm, means for selectively supplying pressure fluid to an end of said first cylinder and to the adjacent end of said second cylinder for effecting rectilinear movement of said side pieces of the core in one of said directons parallel to said axis of the first cylnder, said abutment being engageable with said mounting means of the side pieces during the movement of the central key in the direction opposed to said one direction of movement of the side pieces, thereby to efiect return movement of said side pieces with said central key.

, 4. A machine as in claim 3; further comprising pressure fluid actuated means connected to said mounting means of the side pieces for effecting the swinging movements of the latter about said axis of the first cylinder.

References Cited in the file of this patent UNITED STATES PATENTS 

